Jonathan Wakely
c0a5790430
The size reported by stat is always zero for some special files such as those under /proc, which means the current copy_file implementation thinks there is nothing to copy. Instead of trusting the stat value, try to read a character from a streambuf and check for EOF. For the backport, we also need to avoid trying to use sendfile when stat reports a zero size, so that we use streambufs to copy the file. libstdc++-v3/ChangeLog: PR libstdc++/108178 * src/filesystem/ops-common.h (do_copy_file): Check for empty files by trying to read a character. * testsuite/27_io/filesystem/operations/copy_file_108178.cc: New test. (cherry picked from commit 07a0e108247f23fcb919c61595adae143f1ea02a)
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.